EP 0097563 A1 19840104 - Process for the preparation of colloidal dispersions of cerium dioxide in organic liquids.
Title (en)
Process for the preparation of colloidal dispersions of cerium dioxide in organic liquids.
Title (de)
Verfahren zur Herstellung von kolloiden Dispersionen von Cerdioxid in organischen Flüssigkeiten.
Title (fr)
Procédé de préparation de dispersions colloidales de dioxyde cérique dans des liquides organiques.
Publication
Application
Priority
- US 38740182 A 19820611
- US 46069483 A 19830124
Abstract (en)
[origin: US4545923A] A process is provided for preparing colloidal dispersions of ceric dioxide in inert organic media which comprises (1) heating (a) ceric dioxide comprising ammonium nitrate or ammonium and nitrate ions in an amount within the range from about 3 to about 14% by weight of the ceric dioxide and a member selected from the group consisting of water, methanol, acetic acid and mixtures thereof in an amount usually from about 10 to about 60 g per mole of CeO2, sufficient to effect reaction with (b) an organic acid having from about ten to about forty carbon atoms (c) an organic solvent selected from the group consisting of (i) aliphatic and aromatic hydrocarbons, such as petroleum spirits, benzene, toluene, chlorobenzene, chlorotoluene, etc. (ii) aliphatic and cycloaliphatic ethers, such as isopropyl ether or dicyclohexyl ether (iii) aliphatic and cycloaliphatic ketones, such as diisobutylketone or cyclohexanone at a temperature within the range from about 60 to about 200 DEG C. thereby effecting dispersion of the ceric dioxide; (2) removing water, methanol, acetic acid or mixtures thereof, and separating undissolved particles of solid material such as ammonium nitrate and undissolved cerium dioxide. Association complexes are also provided, composed of ceric dioxide and organic acid having from about ten to about forty carbon atoms in a molar ratio CeO2/organic acid of at least about 4:1.
Abstract (fr)
L'invention a pour objet un procédé de préparation de dispersions colloïdales de dioxyde cérique dans des liquides organiques caractérisé en ce qu'il consiste à chauffer: (a) du dioxyde de cérium comprenant du nitrate d'ammonium et un membre choisi dans le groupe formé par l'eau, le méthanol, l'acide acétique et leurs mélanges, (b) un acide organique ayant environ 10 à environ 40 atomes de carbone, (c) un liquide organique, puis à éliminer l'eau, le méthanol, l'acide acétique libéré pendant le chauffage et à séparer les particules solides non dissoutes. L'invention fournit des complexes constitués par association physique de dioxyde cérique et d'acide organique libre dans un rapport molaire CeO2/acide organique d'au moins 4/1.
IPC 1-7
IPC 8 full level
B01J 13/00 (2006.01); C01F 17/235 (2020.01); C07C 51/41 (2006.01); C07F 5/00 (2006.01); C07F 17/00 (2006.01); C09K 23/00 (2022.01)
CPC (source: EP US)
C01F 17/235 (2020.01 - EP US); C01F 17/30 (2020.01 - EP US); C07C 51/414 (2013.01 - EP US); C07C 309/00 (2013.01 - EP US); C07F 5/00 (2013.01 - EP US); C01P 2002/01 (2013.01 - EP US)
Citation (search report)
- [A] DE 846398 C 19530928 - POTRATZ HANS
- [AD] FR 2359192 A1 19780217 - GAMLEN NAINTRE SA [FR]
- [A] US 3518287 A 19700630 - RINSE JACOBUS
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0097563 A1 19840104; EP 0097563 B1 19860910; AU 1571583 A 19831215; AU 563201 B2 19870702; BR 8303128 A 19840131; CA 1203244 A 19860415; DE 3366038 D1 19861016; US 4545923 A 19851008
DOCDB simple family (application)
EP 83401152 A 19830607; AU 1571583 A 19830610; BR 8303128 A 19830613; CA 430248 A 19830613; DE 3366038 T 19830607; US 46069483 A 19830124